This is a question so many have different views on - sadly.
If you have another look at Matthew 24: 29 - 31, Jesus is crystal clear that it WILL most certainly happen but NOT when most believe and hope, which is either a pre or mid-trib view and is incorrect. IT IS DEFINATELY AFTER TRIBULATION - FULL STOP.
Those 3 verses completely dispel a pre or mid-trib view.
Anyone who tells you otherwise is a false prophet propagating a false doctrine and a false hope. It would be so easy to believe that Jesus will come and take us away before the horror begins, which only leads to a dangerous complacency that somehow it isn't really dangerous because the tribulation won't ever have to be endured. There are so many verses in scripture that confirm a post-trib view. (So many to list.)
Further to that the 'mark of the beast' (666) won't be in place until after the 2nd half of tribulation begins and believers won't take the mark so they WILL go through it - even preferring death over taking the mark and many will die. Revelation 13: 15 says, as many as would not worship the image of the beast should be killed. So who are they who won't worship the beast?
There can be NO persecution of believers unless believers are there and there can be no 'falling away' of believers, unless believers are there in both the 1st and 2nd half of tribulation. Also look at Matthew 24: 22, would God bother to 'shorten these days' if His elect didn't go through it???
Those who believe in a pre or post-trib view always present the weakest arguments for it but they don't prove it as irrefutably as the post-trib does.